8 Answers
8

---WARNING---This will remove any custom settings that you have set up in your application

Windows:
Hold down AltCtrlShift while starting the program.

Mac:
Hold down CommandOptionShift keys while starting the program.

If you are concerned about resetting all of the preferences, you can reset the settings for a specific tool by clicking on its icon int the top left hand corner of the application then choose reset tool from the drop down.

This use to happen to me a lot and it just happened yesterday - after stuffing around with it for an hour I remembered what it was last time. Trying closing Chrome (or Firefox). The shortcuts started working straight away - no restart needed. Weird huh?

If you use CMD+H to hide a window while any Adobe software is running, it disables the spacebar hand tool shortcut. I've tried every other solution and this is the only one that has worked for the past four weeks.

So do NOT use CMD+H to hide windows. If you do so, and disable the shortcut, the only way to get it working again is to re-start your machine.